WO2011145843A2

WO2011145843A2 - Waterproof fluid pump

Info

Publication number: WO2011145843A2
Application number: PCT/KR2011/003575
Authority: WO
Inventors: 김병수
Original assignee: 주식회사 아모텍
Priority date: 2010-05-19
Filing date: 2011-05-16
Publication date: 2011-11-24
Also published as: WO2011145843A3; US20130058813A1; US8888472B2; KR101237022B1; KR20110127310A

Abstract

The present invention relates to a waterproof fluid pump, including: a motor accommodated in a first case and including a stator and a rotor to generate rotational force; an impeller accommodated in a pump housing mounted on the first case, for pumping a fluid by receiving the rotational force of the motor; a supporting shaft fixed to the first case, for rotatably supporting the rotor and the impeller; a first magnet fixed to the rotor for synchronously rotating therewith; and a second magnet fixed to the impeller and disposed opposite the first magnet, the polarity of the second magnet being opposite that of the first magnet. According to the waterproof fluid pump of the present invention, the inflow of the fluid into the motor may be completely blocked.

Description

Waterproof Fluid Pump

The present invention relates to a waterproof fluid pump that can block the flow of fluid, such as water into the motor at the source.

Generally, a water pump motor is used as a driving source of a water pump used to drive a water pump installed in a drainage tank of a washing machine or to supply cooling water to an engine. A water pump equipped with such a water pump motor is always fitted directly with water. It works in the environment it touches.

Therefore, a motor pump or stator having a mechanical seal structure for the purpose of protecting the motor from water when water inside the water pump is drained to the outside or to prevent bearing failure, belt life shortening, etc. due to cooling water leakage. Canned motor pump (canned motor pump) having a can cover structure for sealing the is used.

In the U.S. Patent No. 4,277,115, which proposes the canned motor pump, since the can cover covers only the stator, water is immersed in the rotor, which adversely affects the durability of a bearing supporting the rotating shaft, and a can cover disposed between the rotor and the stator. As a result, the magnetic gap cannot be optimally maintained, resulting in a problem of low efficiency.

In addition, the canned motor pump has a problem in that water is submerged in the rotor and thus affects the rotation of the rotor, thereby degrading motor efficiency.

Moreover, the conventional canned motor pump structure has a problem that the assembly productivity is low because the impeller's rotary shaft is integrally formed with the rotary shaft of the motor and thus the motor and the pump unit cannot be assembled and tested, respectively.

In addition, the can cover of the canned motor pump has a problem in that it is not easy to be combined with the stator core when assembling the stator by forming a PPS material.

In addition, conventionally, the molding cost is increased by inserting the exterior of the stator using a bulk mold compound (BMC) and simultaneously adopting a double sealing structure by a sealing cover for PPS material.

Accordingly, an object of the present invention is to provide a waterproof fluid pump that can separate the motor and the impeller, and transmit the rotational force of the motor to the impeller by using magnetic force to improve the waterproof performance of the motor.

Another object of the present invention is to provide a waterproof fluid pump that does not require a separate waterproofing for waterproofing the motor, and improves the efficiency of the motor by setting the magnetic gap between the rotor and the stator of the motor to an optimal state. have.

Still another object of the present invention is to provide a waterproof fluid pump capable of sealing the motor without any additional device, thereby reducing the manufacturing cost.

A waterproof fluid pump according to an embodiment includes a motor that is accommodated in a first case and includes a stator and a rotor to generate a rotational force, and is accommodated in a pump housing mounted to the first case and receives the rotational force of the motor to receive fluid. An impeller to pump, a support shaft rotatably supported by the rotor and the impeller, fixed to the first case, a first magnet fixed to the rotor and rotated together, and fixed to the impeller facing the first magnet It includes a second magnet that is arranged to be opposite in polarity to each other.

The motor is characterized in that the inner rotor type.

A second case for accommodating a driver is mounted on the open lower surface of the first case, and a third case is sealably mounted on the open lower surface of the second case.

A through hole through which the support shaft passes is formed in the upper plate of the second housing, and the support shaft is fixed to the second housing by insert molding.

The second case is characterized in that the lower end of the support shaft is formed with a press-fit portion fixed.

The rotor includes a back yoke that forms a magnetic circuit and is rotatably supported by the support shaft, a plurality of magnets coupled to an outer circumference of the back yoke, and a rotor support extending from one side of the back yoke and the magnet. do.

A bearing is disposed between an inner surface of the back yoke and an outer surface of the support shaft, and the bearing is configured as an oil-filled ball bearing.

The impeller is rotatably supported at an upper end of the support shaft, and an oilless bearing is disposed between the impeller and the support shaft.

The first magnet is fixed to the upper end of the rotor, characterized in that formed in a ring shape.

The first magnet is disposed on the inner surface of the magnet of the rotor and is characterized in that it is arranged to have the same polarity as the magnet of the rotor.

The first magnet is insert molded to the rotor support together with the magnet of the rotor.

The second magnet is formed in a ring shape to be mounted in a circumferential direction on a lower surface of the impeller, and a back yoke is formed between the impeller and the second magnet to form a magnetic circuit.

As described above, the waterproof fluid pump of the present invention separates the motor generating the rotational force and the pump portion pumping the fluid when the power is applied, and has a power transmission portion generating the magnetic force between the motor and the pump portion, thereby providing water to the motor. Inflow can be blocked at source.

In addition, the waterproof fluid pump of the present invention is isolated from each other between the pump unit having an impeller and the motor composed of the rotor and the stator, so that no additional waterproofing is required, and the magnetic gap between the rotor and the stator of the motor is optimized. By setting, the efficiency of the motor can be improved.

In addition, the waterproof fluid pump of the present invention can block the inflow of water into the motor at the source, it is possible to support the rotating shaft of the motor with the oil-type ball bearing can improve the durability with cost reduction.

1 is a cross-sectional view of a fluid pump according to an embodiment of the present invention.

2 is a schematic cross-sectional view illustrating an example of an electric motor that can be employed in the fluid pump of FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a cross-sectional view of a fluid pump according to an embodiment of the present invention, Figure 2 is a schematic cross-sectional view illustrating an example of an electric motor that can be employed in the fluid pump of FIG.

1 and 2, the waterproof fluid pump according to the exemplary embodiment of the present invention is rotatably supported on the support shaft 27 and the support shaft 27, which are fixedly disposed at the center of the first case 14. When the motor is supported and generates power, the impeller 43 rotatably supported by the support shaft 27 to pump the fluid and the rotational force of the motor 20 are transmitted to the impeller 43. It includes a power transmission unit (30, 40).

The first case 14 is formed with a top plate 14d having a through hole for fixing the support shaft 27 on the upper side thereof, and a lower end thereof is opened.

The support shaft 27 is integrally formed in the first case 14 by insert molding when the first case 14 is manufactured. Therefore, water or other foreign matter may be blocked at the source of the first case 14 through the through hole of the first case 14 through which the support shaft 27 passes.

The lower side of the support shaft 27 is located inside the first case 14 to rotatably support the motor 20, and the upper side of the support shaft 27 is sealable on the upper side of the first case 14. It is located inside the pump housing 15 to be mounted to rotatably support the impeller 43.

On the open lower end of the first case 14, a second case 12 having a closed top shape is fixed to seal the lower end of the first case 14, and a second case 12 is fixed to the open lower end of the second case 12. The third case 11 that seals the inside of the case 12 is fixed.

Here, the driver 36 for controlling the motor is accommodated in the second case 12, and the press-fitting portion 12a in which the lower end of the support shaft 27 is press-fitted and fixed to the upper plate of the second case 12. Is formed.

A cylindrical protrusion 11a is formed in the third case 11 to be inserted into the lower inner surface of the second case 12, and a sealing O-ring 35a is inserted into the protrusion 11a to insert the second case 12. ) And the third case (11).

At least three or more

bolt fixing parts

11b and 12b protrude between the third case 11 and the second case 12 to fasten the fixing screw or the fixing bolt to the coupling hole, and the second case 12. At least three or more

bolt fixing parts

12c and 14b are also protruded between the first case 14 and the fastening screw or fixing bolt to the coupling hole.

The motor 20 is disposed with a stator 26 fixed to an inner surface of the first case 14 and a predetermined gap on the inner surface of the stator 26, and rotates in interaction with the stator 26 and supports shaft 27. And a rotor 25 rotatably supported thereon.

The motor 2 is an inner rotor type, and the rotor 25 is disposed on the inner circumferential surface of the stator 26.

As shown in FIG. 2, the rotor 25 has a back yoke 21 rotatably supported on the support shaft 27 at a central portion thereof, and an isotropic magnet 22a is constant on the outer circumferential surface of the back yoke 21. Are spaced apart.

The rotor 25 is made of a laminated magnetic steel sheet and has a back yoke (ie, a rotor core) 21 formed with a through hole 21a rotatably supported at a support shaft 27 in the center thereof. The ring-shaped isotropic magnet 22a is coupled to the outer circumferential surface of the back yoke 21. The ring-shaped isotropic magnet 22a is divided and magnetized so that the N pole magnet and the S pole magnet are alternately formed.

The rotor 25 is preferably formed on the upper and lower surfaces and the outer circumferential surface of the back yoke 21 and the isotropic magnet 22a by using a resin in an insert molding method to integrally form the rotor support 22d in terms of sealing.

This rotor support 22d is effective for sealing a magnet located therein when the fluid pump is used in a humid environment such as a water pump.

In addition, the rotor 25 may have a plurality of recesses formed at predetermined angles on the outer circumferential surface of the back yoke 21 to insert a plurality of embedded anisotropic auxiliary magnets 22b having a segment shape.

In this case, the embedded anisotropic auxiliary magnet (22b) is a hard magnet, for example, SmCo ₅ system, Sm ₂ Co _17- based, Nd ₂ Fe ₁₄ B-based, Sm ₂ Fe ₁₇ N _3- based rare earth alloy A magnetic material is used, and in particular, an Nd-based alloy having a high energy (BHmax) is preferably, for example, Nd-Fe-B (anisotropic magnet).

Further, an isotropic magnet 22a made of a ferrite-based material, which can be purchased at low cost, and formed in a ring shape is coupled to the outer circumference of the back yoke 21, for example.

The embedded anisotropic auxiliary magnet 22b is formed by the magnetic flux by the anisotropic auxiliary magnet 22b and the current flowing through the coil 24 of the stator 26 by magnetizing in the radial direction of the rotor 25 to form an anode. The interaction between the rotating magnetic fields generates a rotating torque.

On the other hand, a plurality of leakage is arranged in a circular direction along the circumferential inner side of the buried anisotropic auxiliary magnet 22b with a length corresponding to the length of the anisotropic auxiliary magnet 22b every two anisotropic auxiliary magnet 22b. A prevention hole, that is, a spacer 28 is formed, and the spacer 28 increases magnetic resistance to prevent magnetic flux leakage. As a result, the embedded anisotropic auxiliary magnet 22b has a magnetic circuit formed from the north pole to the south pole in the lateral (ie, circumferential) direction.

As a result, in the rotor 25 of the present invention having the above-described structure, for example, eight embedded anisotropic auxiliary magnets 22b and ring-shaped isotropic magnets 22a magnetized into eight poles are combined with each other to give a total of 8 It has a hybrid magnet structure having a pole magnetic pole, and due to the anisotropic oriented buried anisotropic auxiliary magnet 22b, the hybrid magnet as a whole can maintain a magnetic force equal to or higher than that of the anisotropic auxiliary magnet.

Upper and

lower bearings

33b and 33a are mounted on the upper and lower sides of the support shaft 27 positioned inside the first case 14 to rotatably support the rotor 25.

Here, since the upper bearing 33b and the lower bearing 33a have no water inflow into the interior of the first case 14, the upper bearing 33b and the lower bearing 33a use oil-type ball bearings without waterproof function. This makes it possible to increase the durability and reduce the manufacturing cost compared to oilless bearings. Of course, the lower and

upper bearings

33a and 33b may use oilless bearings.

The stator 26 is a coil 24 is wound after the bobbin is coupled to the integrated stator core 23 having a plurality of teeth 23a on the inner circumference of the cylindrical body 23b formed by stacking a plurality of magnetic steel sheets. Has a structure.

After the coil 24 is wound around the bobbin formed outside the stator core 23, the stator 26 may be formed in a reducing shape by insert molding using a BMC in an outer circumferential portion to reinforce the sealing performance.

Furthermore, the stator 26 may employ a structure integrated by a stator support after coils are wound around a plurality of split cores in addition to the integrated stator core 23.

The stator 26 receives a driving signal for the stator coil 24 from the driver 36 embedded in the second case 12.

An inlet 15a through which the fluid flows into the pump housing 15 is formed in the upper center of the pump housing 15, and an outlet 15b through which the pumped fluid is discharged is formed at the side of the pump housing 15. In addition, the lower end of the pump housing 15 is fixedly sealably fixed to the upper end of the first case 14 in an open state.

At least three

bolt coupling parts

14c and 15d protrude from each other between the pump housing 15 and the first case 14 so that the fixing screw or the fixing bolt is fastened to the coupling hole. In addition, a sealing O-ring 35b is inserted between the outer circumferential surface of the first case 14 and the inner circumferential surface of the pump housing 15 to seal between the first case 14 and the pump housing 15.

Impeller 43 is disposed on the fluid flow passage (P) formed in the pump housing 15 to pump the fluid flowing from the inlet (15a) to be discharged to the outlet (15b), the disk-shaped body ( 43a) and a plurality of wings 43b radially formed on the body 43a.

The impeller 42 is rotatably supported above the support shaft 27, and a bearing 34 is disposed between the support shaft 27 and the impeller 42.

The stopper 44 is coupled to the upper end of the support shaft 27 to prevent the bearing 34 from being separated.

The bearing 34 preferably uses an oilless bearing such as a carbon bearing or a plastic bearing in consideration of contact with the fluid.

The power transmission unit 30.40 is fixed to the rotor 25 and is disposed to face the first magnet 30 and the first magnet 30 that rotates together with the rotor 25, and the first magnet 30 and the attraction force are It includes a second magnet (40) having a different polarity than the first magnet (30) to be fixed to the impeller (43).

The first magnet 30 is preferably fixed to the upper end of the rotor 25 and formed in a ring shape. In addition, the first magnet 30 may be disposed on the inner circumferential surface of the magnet 22a of the rotor 25 and may have the same polarity as the magnet 22a of the rotor 25.

This first magnet 30 is insert molded together with the magnet 22a of the rotor 25 when the rotor support 22d is manufactured and fixed to the rotor support 22d. Therefore, a separate process for fixing the first magnet 30 to the rotor 25 is unnecessary, and the manufacturing process can be shortened.

The first magnet 30 is composed of split magnet pieces of a plurality of N poles and S poles, or a magnet in which N poles and S poles are separately magnetized in a ring magnet.

In this case, it is preferable that a plurality of divided magnet pieces or ring-shaped divided magnetized magnets forming the first magnet 30 are arranged so as to coincide with the same magnetic poles of the divided magnetized magnets of the magnet 22a.

The first magnet 40 is formed in a ring shape that is mounted in the circumferential direction below the impeller 43, and the back yoke 41 is formed between the first magnet 40 and the impeller 43 to form a magnetic circuit. Can be.

The second magnet 40 has a polarity opposite to that of the first magnet 30, and consists of a plurality of N-pole and S-pole split magnet pieces, or a magnet in which the N-pole and S-pole are split and magnetized in a ring-shaped magnet. Can be made.

The first magnet 30 and the second magnet 40 has a mutually opposite magnetic poles on the parts facing each other so that the mutual attraction action to transfer the rotational motion of the first magnet 30 to the second magnet 40 It is arranged as a split magnet piece or a split magnetized magnet.

As described above, the operation of the fluid pump according to the embodiment of the present invention constituted will be described below.

When power is applied to the stator 26 of the motor 20, the rotor 25 is rotated by the interaction of the stator 26 and the rotor 25, and the first magnet 30 fixed to the rotor 25 is Is rotated.

Then, the second magnet 40 is rotated together by an attractive force acting between the second magnet 40 disposed to face the first magnet 30.

Accordingly, the impeller 43, to which the second magnet 40 is fixed, rotates on the support shaft 37 to pump the fluid flowing into the inlet 15a to be discharged to the outlet 15b.

As such, the fluid pump according to the exemplary embodiment of the present invention uses water to the motor 20 because the impeller 43 for pumping the fluid and the motor 20 for generating the rotational force for driving the impeller are mechanically separated. It is possible to fundamentally block the inflow of fluid, such as.

Moreover, the fluid pump according to the embodiment of the present invention is provided with a

power transmission unit

30, 40 in which the motor 20 and the impeller 43 are separated and use magnetic force between the motor 20 and the impeller 43. As a result, a separate sealing part for sealing the motor 20 is unnecessary, and the magnetic gap between the rotor 25 and the stator 26 of the motor 20 can be set to an optimal state to improve the efficiency of the motor. .

In addition, the fluid pump according to an embodiment of the present invention is capable of supporting the rotor 25 with a general bearing that does not adopt a waterproof structure, since the inside of the motor 20 can be waterproofed in nature, thereby improving durability with cost reduction. Can be improved.

In the above embodiment, the driver is accommodated in the second case, but the driver may be disposed in the first case.

In addition, in the above embodiment, the stator 26 is disposed at the outside to rotate the first magnet 30, and the rotor 20 motor 20 having the rotor 25 is disposed at the center through the magnetic gap. Although used is illustrated, as long as it provides a rotational force capable of rotationally driving the first magnet 30, it is also possible to use a motor of any structure, for example, an outer rotor type or a double rotor type motor.

In addition, in the above embodiment, a core type stator is used, but a coreless type stator may be used.

Further, in the above embodiment, the back yoke 41 is formed on the inner side of the second magnet 40. For example, the back yoke 41 is disposed, but it may be removed.

The fluid pump according to an embodiment of the present invention mechanically separates between the motor generating the rotational force and the impeller pumping the fluid, and uses the magnetic force to transmit the rotational force of the motor to the impeller so as to naturally waterproof the motor. It can be applied to a fluid pump requiring sealing of a motor such as a water pump or fuel pump.

Claims

A motor accommodated in the first case and having a stator and a rotor to generate rotational force;

An impeller accommodated in a pump housing mounted to the first case and pumping fluid by receiving rotational force of the motor;

A support shaft on which the rotor and the impeller are rotatably supported and fixed to the first case;

A first magnet fixed to the rotor and rotating together; And

And a second magnet fixed to the impeller and disposed to face the first magnet and having opposite polarities to each other.
The method of claim 1,

The motor is waterproof fluid pump, characterized in that the inner rotor type.
The method of claim 1,

A waterproof fluid pump according to claim 1, wherein a second case accommodating a driver is mounted on the open lower surface of the first case, and a third case is sealably mounted on the open lower surface of the second case.
The method of claim 3,

The upper plate of the second housing is formed with a through hole through which the support shaft passes,

The support shaft is a waterproof fluid pump, characterized in that fixed to the second housing by the insert molding method.
The method of claim 3,

Waterproofing fluid pump, characterized in that the second case is formed with a press-fitting portion is fixed to the lower end of the support shaft.
The method of claim 1,

The rotor forms a magnetic circuit and a back yoke rotatably supported by the support shaft;

A plurality of magnets coupled to an outer circumference of the back yoke; And

And a rotor support extending from one side of the back yoke and the magnet.
The method of claim 6,

A bearing is disposed between the inner surface of the back yoke and the outer surface of the support shaft,

The bearing is a waterproof fluid pump, characterized in that consisting of an oil-filled ball bearing.
The method of claim 1,

The impeller is rotatably supported on an upper end of the support shaft, the waterproof fluid pump, characterized in that the oilless bearing is disposed between the impeller and the support shaft.
The method of claim 1,

The first magnet is fixed to the upper end of the rotor, characterized in that formed in a ring shape waterproof fluid pump.
The method of claim 1,

The first magnet is disposed on the inner surface of the magnet of the rotor and the waterproof fluid pump, characterized in that arranged to have the same polarity as the magnet of the rotor.
The method of claim 6,

And the first magnet is insert molded into the rotor support together with the magnet of the rotor.
The method of claim 1,

The second magnet is formed in a ring shape to be mounted in the circumferential direction on the lower surface of the impeller, a waterproof fluid pump, characterized in that a back yoke is provided between the impeller and the second magnet to form a magnetic circuit.